Page:Sir William Herschel, his life and works (1881).djvu/167

Rh only sixty years later that they were properly re-observed by Mr., who has the great honor of having added as many more, and who first settled the vexed question of satellites exterior to Oberon, and this with a reflecting telescope made by himself, which is unequalled by any other of its dimensions.

In the introduction to his paper on the Nature and Construction of the Sun and Fixed Stars (1795), recounts what was known of the nature of the sun at that time. had shown that it was the centre of the system; and his successors had determined its rotation, the place of its equator, its real diameter, magnitude, density, distance, and the force of gravity on its surface. He says:

"I should not wonder if, considering all this, we were induced to think that nothing remained to be added; and yet we are still very ignorant in regard to the internal construction of the sun." "The spots have been 7